Fume and vapour extraction unit benchvent bv500s d a fume and vapour extraction unit that uses a 2m x oslash 100mm flexi duct to vent harmful and unwanted vapours to either a standard domestic vent or a convenient window suitable for use within laboratory workshop classroom and anywhere where there is a need for the extraction of fumes and fine particles whilst handling monomers adhesives hazardous powders conformal coatings resins sealants solders light grinding particles and dus